SB settings works fine on iPad but isn't optimised for the larger screen , but it's still worth having definitely.

Activator is something you're sure to need as is CyDelete

Barrell works fine on iPad & is a nice touch & will impress your friends or if you don't have any, your dog will love it.

Definitely get ifile & mobile terminal you will need these..

Scrollingboard is a good one it's like infinidock & infinifolders all in one, plus you can put addons & widgets to your dock

*mod edit*

Unlockfx let's you choose from a bunch of cool animations which work when you unlock your pad, another nice visual touch

Have a browse through Notificatiom Centre addons in cydia, the iPad NC is rather limited

Springtomize 2 for OS 5+ is surely the best all round personalisation package , I always start there on a newly jailbroken device, & there are tons of options there which will keep you busy for a while